I have this in dnsmas.conf to advertise the current ipv6 prefix:


If the prefix gets changed, dnsmasq starts to announce the new prefix, but it 
keeps announcing the old one (as deprecated) as well for a while.

I wonder why the value of ${lease_time} is not used verbatim? It is forced to 
be at least 120, which might be fine for real DHCP. In practice this means a 
stale and unusable prefix is announced as "valid = 120, preferred = 0" for 
about two minutes. It seems clients can cope with it. Still, I would like to 
zap the old prefix "instantly" with lease_time=1.


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